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Since your scale (like PageRank) is a logarithmic scale, it makes it hard to judge the distance between 2 scores.  Can you give me a rule of thumb.  For PageRank,  each jump is an exponential jump - so that a PR6 is perhaps 10 times stronger than a PR5. What is the log base that SEOMoz uses.   Should I assume that a 60 is 10 times stronger than a 50? This is important when it comes to measuring progress because growth is going to get more difficult as you move up the scale and I need to communicate the distance between our current Authority score and our goal. Thank You!

Hello! My question is as follows: Suppose there is SiteA which is a blog that has a url structure of http://www.siteA.com/blog/category/article Now suppose I'd like to redirect those articles to a new domain (which has the same url structure) BUT excluding a certain category, say, 'blah/' so in other words, some examples: http://www.siteA.com/blog/shoes/best-shoes-to-buy ->redirects-> http://www.siteB.com/blog/shoes/best-shoes-to-buy/ (there is a trailing slash here for some reason) BUT http://www.siteA.com/blog/blah/foo-bar -NO REDIRECT- (because it's in the /blah/ category). Any and all feedback & help would be much appreciated 🙂  Thanks!~

Any downsides to having multiple (similar) eCommerce sites linked to the same Google Analytics account? Traffic splitting or other penalties? I've heard a range of answers from "Yes, traffic was split between my two first-page ranked sites, it was awful" to "no, Google couldn't care less/ they'd be able to tell if your sites were related outside of having them in the same account anyways" Any info would be much apprecaited 🙂 Thanks!